On 07/27/2017 09:45 PM, Jeff Janes wrote:> Here is an updated patch.
This version allows you use the password-less
connection if you either are the super-user directly (which is the
existing committed behavior), or if you are using the super-user's
mapping because you are querying a super-user-owned view which you have
been granted access to.
I have tested the patch and it passes the tests and works, and the code
looks good (I have a small nitpick below).
The feature seems useful, especially for people who already use views
for security, so the question is if this is a potential footgun. I am
leaning towards no since the superuser should be careful when grant
access to is views anyway.
It would have been nice if there was a more generic way to handle this
since 1) the security issue is not unique to postgres_fdw and 2) this
requires you to create a view. But since the patch is simple, an
improvement in itself and does not prevent any future further
improvements in this era I see no reason to let perfect be the enemy of
good.
= Nitpicking/style
I would prefer if
/* no check required if superuser */
if (superuser())
return;
if (superuser_arg(user->userid))
return;
was, for consistency with the if clause in connect_pg_server(), written as
/* no check required if superuser */
if (superuser() || superuser_arg(user->userid))
return;
Andreas
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